Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fe8effdcc684b7…

MALICIOUS

PDF

36.7 KB Created: 2020-08-09 01:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03a730cbf1b64b4174e5fe4ae4c264ca SHA-1: 4ec58503e953401905c1c3a30e05eaf8e691dde5 SHA-256: 86fe8effdcc684b72511be64ed2e253215b66666e67cbfc8f96b87db11a7af7d
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits malicious behavior through a link farm, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The primary malicious URL identified is https://ttraff.ru/pify?keyword=subtraction+regrouping+pdf, which is likely used to redirect users to further malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text and a reference to the malicious URL, suggesting an attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=subtraction+regrouping+pdf
    • http://files.nucec.net/uploads/1/3/0/7/130775102/d707264.pdf
    • http://files.sunshinefamilyhealthcare.com/uploads/1/3/1/8/131857115/7285241.pdf
    • http://files.dizzycoach.com/uploads/1/3/0/8/130874129/redesoba-xurun.pdf
    • http://files.dojobianco.com/uploads/1/3/1/3/131380052/giwuje.pdf
    • http://files.clinicalalliancenetwork.com/uploads/1/3/1/4/131437822/xapodesapeboru.pdf
    • https://cdn.shopify.com/s/files/1/0431/2301/5836/files/42978798521.pdf
    • https://cdn.shopify.com/s/files/1/0434/2648/0295/files/64921892490.pdf
    • https://cdn.shopify.com/s/files/1/0435/9513/7181/files/wiiu_usb_helper_title_key.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/89381210851.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/89377355024.pdf
    • https://cdn.shopify.com/s/files/1/0428/4373/4172/files/57560381873.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/netine.pdf
    • https://cdn.shopify.com/s/files/1/0440/6394/8950/files/jujavaweraxomekifogesena.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/5360582242.pdf
    • https://cdn.shopify.com/s/files/1/0432/2466/2173/files/ctet_eligibility_2020.pdf
    • https://cdn.shopify.com/s/files/1/0434/9237/6741/files/fapezajitexazolupef.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050a3.bin
5502767cf181f4c8191f010f8ae4b14910efa097dd3f328734e80976f0b8846d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50A3 5356 bytes
font_01_sfnt_off000062e7.bin
7dc1b751ad7561a2c790be765e16ef36da714a1fbc825f11893cfd3c18ea9635		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62E7 10376 bytes

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